Registration sample: adapt to xfeatures2d

modules/reg/samples/map_test.cpp

@@ -47,7 +47,7 @@
 #include <opencv2/highgui/highgui_c.h>
 
 #ifdef COMPARE_FEATURES
-#include <opencv2/xfeatures2d/nonfree.hpp>
+#include <opencv2/xfeatures2d.hpp>
 #include <opencv2/calib3d.hpp>
 #include <opencv2/calib3d/calib3d_c.h>
 #endif
@@ -67,6 +67,7 @@ static const char* DIFF_REGPIX_IM = "Image difference: pixel registered";
 
 using namespace cv;
 using namespace cv::reg;
+using namespace cv::xfeatures2d;
 using namespace std;
 
 static void showDifference(const Mat& image1, const Mat& image2, const char* title)